A string that is 0.15 m long and fixed at both ends is vibrating ...

[Deast7027]

A string that is 0.15 m long and fixed at both ends is vibrating in its n = 5 harmonic. The sound from this string excites a pipe that is long and open at both ends into its second overtone resonance.
 
  What is the distance between a node and an adjacent antinode, in the string? The speed of sound in air is 345 m/s.
  A) 7.5 mm B) 23 mm C) 150 mm D) 30 mm E) 15 mm

Question 2

If Planck's constant were ten times smaller than it is, quantum effects would be
 
  A) easier to detect.
  B) more difficult to detect.
  C) neither easier nor more difficult to detect.

[Danny Ewald]

Answer to Question 1

E

Answer to Question 2

B

[Deast7027]

Excellent

[Dinolord]

TYSM